Vakarchuk, S. B. and Myskin, K. Y. (2005) “Some Problems of Simultaneous Approximation of Functions of Two Variables and Their Derivatives by Interpolation Bilinear Splines”, Ukrains’kyi Matematychnyi Zhurnal, 57(2), pp. 147–157. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3583 (Accessed: 7May2024).